Archive abstract

Abstract of the proposal for the experiment RSG13


One of the major unsolved questions concerning the understanding of the
active galactic nucleus (AGN) population is the origin of the dichotomy
between radio-quiet and radio-loud AGNs. The accretion flow and its
associated jet should be completely determined by the fundamental
parameters of the supermassive black hole (SMBH), its mass and spin,
and the mass accretion rate onto the black hole. Collected so far
observational results suggest that radio-quiet/radio-loud AGN dichotomy
could be explained at least partially by accretion flow properties.
Here we propose a short e-VLBI observations of SDSS J142746.39+293038.2,
an AGN classified as Seyfert I object, that recently has undergone a slow,
significant optical flare with the amplitude ~2m (Gaia19axp - AT 2019brs).
Our spectroscopic follow-up shows the transition in the accretion mode
and significant increase of the accretion disc temperature. We would
like to check if there is any sign of radio activity that could be
connected with the Gaia19axp event. The putative detection could be
important step forward in our understanding of the origin of the
radio-quiet/radio-loud AGN dichotomy.

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